Which of the following must occur in order for a repressible operon to be transcribed?
A)A corepressor must be present.
B)RNA polymerase and the active repressor must be present.
C)RNA polymerase must bind to the promoter,and the repressor must be inactive.
D)RNA polymerase cannot be present,and the repressor must be inactive.

Question

Quizplus · Accepted Answer

For a repressible operon to be transcribed, RNA polymerase must bind to the promoter and the repressor must be inactive. The presence of a corepressor would actually inhibit transcription, and the presence of only RNA polymerase or only an active repressor would not be sufficient for transcription to occur.

Which of the Following Must Occur in Order for a Repressible